Jack Mattingly is a genius. He has an IQ of 170. He speaks fluent Mandarin and Latin. And he can calculate the square root of 1,673,549 in his head. But when Jack's parents' car is hi-jacked, with him inside it, for once he's as clueless as the rest of us. The car-jacker doesn't know Jack's in the car - yet. But it's only a matter of time before he's discovered. And then anything could happen. Only one thing's for sure: Jack's in for the thrill-ride of his life . . . A high-octane adventure from the winner of the Blue Peter Book of the Year Award.